Die-stock.



L. B! CURTIS.

DIESTOCK.

APPLICATlON FILED JuLY3l, 1914.

Patent-ed May 25; 1915.

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DIE STOCK;

APPLICATION FILED JULY 31. 1914. 1,140,504. Patented May 25,1915.

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[H 4 5 In? 4 i w 2 1 1 -2 I 5 .l J'- h Wflncoom THE NORRIS PETERS C0,. PHO1D-LITHOH WASHINGTON. D. C

LEWIS B. CURTIS, OF BRIDGEPORT, CONNECTIGUT.

DIE-STOCK.

Specification of Letters Patent. Pal/tented May 25, 1915.

Application filed July 31, 1914. Serial No. 854,317.

To all whom it may concern:

Be it known that I, LEWIS B. CURTIS, a citizen of the United States, residing at the city of Bridgeport, county of Fairfield, State of Connecticut, have invented certain new and useful Improvements in Die- Stocks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the subject of thread cutting, and the principal aimof the same is to produce a simple, efl'ective and novel tool or machine for cutting taper threads.

The invention contemplates in its general organization means whereby the cutters or dies may be readily adjusted to any gage, such adjusting means including eccentrically mounted cutter-engaging blocks each 7 of which presents a continuous surface to the cutter that is to be adjusted, means being also provided whereby the blocks may be readily manipulated to effect the desired adjustments. I

In carrying out the invention as generally stated above it will be understood that the essential features of the same are susceptible to changes in details and structural arrangements, a simple and practical embodiment of the invention being shown in the accompanying drawings, wherein- Figure 1 is a top plan view of the improved thread cutter, parts thereof being broken away. Fig. 2 is a central vertical sectional view. Fig. 3 is a detail perspective view of one of the dies or cutters adapt ed for use with this invention. Fig. 1 is a detail perspective view of one of the cutteradjusting blocks.

This invention has specially in view an improvement in the adjusting and operating mechanism for cutters or dies of taper threading tools and machines, and has been shown in connection with one type of such tool which includes a work holder 1 to which is threaded a carrier 2 equipped with radial ways 3 for the dies 4;.

A iide 5 is rotatably seated on a flange 6 of the work holder 1.

A. housing 7 is formed in the guide 5 by the upper flange 8 that projects inward and the base ledge 9 that seats on the flange e of work holder 1.

The flange 8 and ledge 9 of the guide 5 are provided with regularly disposed bearings which correspond in number and lo cation with the radial ways 3 of the carrier 2, such bearings being conveniently formed by making registering slots 10 and 11, respectively, in said flange and ledge.

The blocks that serve to adjust the cutters have been designated generally by the numeral 12 and are preferably semi-circular in shape and are eccentrically pivotally mounted in the bearings 10 and 11. The pivots 13 and 14L- of the blocks 12 may be integral with said blocks and are disposed at one corner of said blocks and project from the upper and lower surfaces thereof and are mounted in the bearings 10 and 11. The blocks 12 are preferably of substantially the same height as the housing 7 and may be readily slipped into position therein as the inner ends of the bearings 10 and 11 are 7 open. The blocks 12 taper longitudinally and are so disposed that they present a cutter-engaging surface that is longitudinally beveled and transversely curved on an arc of a circle, such cutter-engaging surface being designated by the numeral 15. The dies or cutter 4: may be of the type shown in Fig. 3 of the accompanying drawings wherein the end that is engaged by the blocks 12 is pointed, as indicated at 4? and beveled complemental to the surface 15 of said blocks. This type of die or cutter is of advantage in that it reduces friction to the minimum, but of course is not essential.

The pivots 13 of the blocks 12 are elongated so that they project through and beyond the flange 8, and their outer ends are slotted, as indicated at 16, for the reception of a screw driver or other type of turning tool for pivotally manipulating the blocks 12, if desired. It is preferred, however, to provide means for simultaneously manipulating the blocks 12, such means including a pinion 17 fast on the projecting portion of each pivot 13 and which mesh with the eX- ternal teeth of a ring gear 18 seated on the flange 8, nuts 19 and washers 20 being mounted on the pivots 13, the washers 20 overlapping the ring gear 18 and thereby holding said gear in position to mesh with the pinions 17. The ring gear 18 may be provided with openings or the like 21 to be engaged by a spanner, crank, or other type of wrench to facilitate rotation of said gear and thereby cause the pinions 14: to pivotally swing the blocks 12.

It will be understood from the foregoing that by providing the surface 15, a slngle surface of each block is sufiicient to adjust the dies 4- for all classes of work. To facilitate the adjusting of the blocks 12, said blocks may be suitably marked to indicate standard and other gages, as indicated in Fig. 4.

What I claim as my invention is 1. A thread cutter comprising a work holder, a die guide carried thereby, a die carrier having a threaded connection with the Work holder, and die-engaging and adjusting blocks pivotally connected to the guide and each provided with a continuous die-engaging surface that is curved on an arc of a circle and longitudinally inclined.

2. A thread cutter comprising a work holder, a die guide having a rotatable con nection with the work holder, a die carrier having a movable connection with the work holder, and die-engaging and adjusting blocks eccentrically pivoted to the guide and having curved and longitudinally inclined surfaces for engaging dies.

3. A thread cutter comprising a work holder, a die guide and a die carrier connected to the work holder, and die-adjusting blocks eccentrically pivoted to the guide and provided with die-engaging surfaces that are transversely curved and longitudinally inclined.

4:. A thread cutter comprising a work holder, a die guide rotatably connected therewith, a die carrier movable longitudinally'of the work holder, and die-engaging and adjusting blocks eccentrically connected to the guide and provided with longitudinally inclined elongated continuously curved die-engaging surfaces.

5. A thread cutter comprising a work holder, a die guide, a die carrier, longitudinally inclined die-engaging and adjusting blocks pivotally connected to the guide, and means for simultaneously effecting pivotal adjustments of the blocks.

6. A thread cutter comprising a work Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

holder, a die guide, a die carrier, longitudinally inclined die-engaging and adjusting blocks pivotally connected to the guide, a pinion carried by each block, and means for simultaneously rotating the pinions to ad just the blocks.

7. A thread cutter comprising a work holder,ea die guide carried thereby, a die carrier connected to the work holder, longitudinally inclined die-engaging and adjusting blocks pivotally connected to the guide, a pinion fast on each block, and a gear carried by the guide and engaging the pinions for effecting a simultaneous pivotal adjustment of the blocks.

8. A thread cutter comprising a work holder, a die guide carried thereby and provided with a housing, a die carrier, and die-. engaging and adjusting blocks having eccentric pivotal mountings in the housing of the guide and provided with a longitudinally inclined continuous surface for engaging dies.

9. A thread cutter comprising a work holder, a die guide provided with a housing, a die carrier provided with radial dieways disposed in alinement with the housing, dies disposed in the Ways and-having pointed inclined outer ends, and die adjusting blocks eccentrically mounted in the housing and provided with die-engaging surfaces that are longitudinally inclined and continuously curved.

10. A die-adjusting block for taper thread cutters comprising a block of metal having.

a surface for engaging dies that is continuous and curved on an arc of a circle and longitudinally inclined, said block of metal having one corner portion thereof provided with means for eccentric pivotal connec tion with a thread cutting machine. In testimony whereof I affix my signature in presence of two witnesses.

LE /VIS B. CURTIS. WVitnesses:

F. W. SMITH, Jr., M. T. LONGDEN.

Washington, D. C. 

